Technically any exception can be raised on an import (including those that are in the standard library as well as custom exceptions). But if you look at the built-in Exceptions, the only two errors that call out being raised on import are ImportError and SyntaxError.
What is your intent with catching the SyntaxError? What do you want the program to do when the import fails?
What is your intent with catching the SyntaxError? What do you want the program to do when the import fails?